Hey everyone, if you’ve ever worked in manufacturing, automotive, aerospace, or even DIY projects that need solid, long-lasting threaded holes in soft materials like plastic, aluminum, or wood, you’ve probably crossed paths with self-tapping inserts. These tiny but game-changing parts solve a huge problem: plain threaded holes in soft stuff strip way too easily when you tighten a bolt or screw. As a self-tapping inserts supplier, I get asked all the time, “What are the common brands people actually reach for?” So today, I’m breaking down the go-to brands that I stock, sell, and recommend to my clients, plus a little real talk about why they matter, no boring jargon—promise. Self-Tapping Inserts
First, let’s get one thing straight: not all self-tapping inserts are the same. The “self-tapping” part means they cut their own internal threads when you drive them into a pre-drilled hole, right? So you don’t need to tap the hole first. That’s why they’re so popular for everything from holding dashboard trim in cars to securing circuit boards in electronics to even outdoor furniture that takes a beating year-round. Now, when it comes to brands, some have been around for decades and built their rep on quality, while newer ones carve out a niche for specific use cases. I don’t just pick random ones off the shelf—most of these I’ve tested myself, or my long-term clients have given me feedback that’s solid.
Let’s start with the big dog everyone knows: E-Z LOK. Wait, full disclosure, E-Z LOK is probably the first brand I ever stocked when I got into this business, back when I was a one-man shop driving around local machine shops with a trunk full of inserts. They’ve been around since the 1960s, so they know their stuff. What makes E-Z LOK stand out? Their inserts are usually made from heat-treated steel, which means they don’t strip even if you over-tighten a bolt or have to reuse the hole a bunch of times. I see E-Z LOK used everywhere—automotive companies use them for door panels, aerospace for interior cabin parts, even HVAC manufacturers for their blower motors. The self-tapping version (their 300 Series, if you care) is super easy to install, too. You just drill the right size hole, thread the insert onto your installation tool, drive it in until it’s flush, and boom—you have a threaded hole that’s way stronger than the plastic or aluminum it’s in. The only downside? They’re a little pricier than some no-name brands, but for most people, the durability is worth it. I had a client last year who makes RVs, and they switched from a cheaper brand to E-Z LOK because their warranty costs dropped by 40%—that’s real money.
Next up, Helical Insert Systems—wait, but hold on, not to mix them up with the threaded inserts you see in bolts, these are self-tapping ones, right? Wait, no, Helical actually has a line of self-tapping inserts, but their big thing was originally the wire thread inserts (like Heli-Coil, which is a whole other thing). Wait, I should clarify: Heli-Coil is the wire insert brand, but Helical Insert Systems has a self-tapping line called the Helical STI Insert. Yeah, that’s important because a lot of people mix those up. The Helical STI is super popular for metal applications, especially thin aluminum. If you’re working with 1/8” thick aluminum and need a thread that won’t pull out, this is the go-to. They’re made from stainless steel usually, so they don’t rust if you’re using them for outdoor parts. I stock a lot of these for marine clients, too—boats have a ton of thin aluminum parts that take a lot of saltwater exposure. The Helical STI cuts its own threads as you drive it, so you don’t have to worry about cross-threading half as much as you would with other brands. One tip from me: if you’re installing these in a hard material, use a lubricant on the insert to make it go in smoother, less chance of it cracking.
Now, there’s a brand that’s a little more budget-friendly but still trusted for many uses: Keenserts. Wait, Keenserts are unique, right? They have those little tangs that lock into place once you install them, so they can’t spin or pull out even if the material around them fails. Oh, that’s a big one. A lot of people use Keenserts when they’re dealing with really soft materials, like plastic injection molding or even wood. I sell a lot of these to furniture manufacturers, both indoor and outdoor. For example, if you’re making a wooden dining table that has metal legs attached, a self-tapping insert that spins in the wood is useless. Keenserts’ tangs dig into the wood (or plastic) as you drive it, so it’s permanently anchored. They also have a self-tapping version, so you don’t need to pre-tap, which saves time on assembly lines. The price is lower than E-Z LOK for comparable sizes, so they’re great for high-volume projects where cost is a factor but quality still matters. I had a client that makes outdoor playground equipment switch to Keenserts a couple years ago, and they told me they haven’t had a single return for loose bolts since then—pretty solid.
Wait, can’t forget about the ones that focus on plastic-specific applications, right? A lot of self-tapping inserts are made for metal, but plastic is a whole different beast because it’s softer, can melt if you apply too much heat, and expands and contracts with temperature changes. So there’s a brand called ThreadForm that’s all about that. ThreadForm makes inserts that are designed to not damage plastic, even when you’re driving them at high speed on an assembly line. Their self-tapping inserts have a special flute design that cuts threads without creating too much debris, which is huge for electronics—you don’t want plastic shavings getting on circuit boards, right? I work with a few consumer electronics brands, and they swear by ThreadForm. They also have inserts for 3D printed parts, which is a growing market. A lot of hobbyists and small manufacturers doing 3D prints reach out to me for ThreadForm inserts because regular steel inserts can crack a PLA or PETG print, but ThreadForm’s ones are made from a softer alloy that grips the plastic without breaking it. That’s a game-changer for people who make custom parts for robotics or home gadgets.
Oh, and there’s a newer brand that I’ve been testing the last year or so: Insert Solutions. Wait, not the big industrial Insert Solutions, the mid-sized one that does a lot of custom inserts for specific industries. They don’t have the name recognition of E-Z LOK, but their custom self-tapping inserts are amazing for niche uses. For example, a client that makes medical devices needed an insert that’s compatible with sterilization processes (autoclaving) and non-magnetic, so we worked with Insert Solutions to make a custom stainless steel insert that fits exactly their part. The quality is on par with the big names, and they’re flexible if you need small batches or custom sizes, which the big brands usually don’t do. I think this is a big one for small businesses and startups that can’t afford big minimum orders from the top brands. I stock a handful of their standard sizes too, just in case someone needs a reliable insert without waiting 6 weeks for a custom order.
Wait, let’s talk about no-name brands, too—because I get a lot of clients asking about those cheap inserts on Amazon or Alibaba that are half the price. I won’t lie, I’ve tried them, and they’re fine for super low-stakes stuff. Like, if you’re building a bookshelf at home and using particle board, a $10 pack of no-name self-tapping inserts will work. But if you’re in manufacturing, or making a part that needs to last 10 years, those cheap ones usually strip after a few uses. The steel is lower quality, so it softens when you tighten a bolt too much, or the threads are poorly cut, so they cross-thread all the time. I had a client a while back who bought a bunch of cheap inserts for their appliance line, and they had to do a full recall because 15% of the inserts stripped during assembly. That cost them way more than if they’d just bought the good stuff. So my advice to everyone: don’t skimp on inserts for critical parts.
Now, a quick pro tip from a supplier who’s dealt with all of this: when you’re choosing a self-tapping insert, first figure out what material you’re putting it in. If it’s plastic, go for ThreadForm or Keenserts. If it’s thin aluminum or metal, Helical STI is perfect. If it’s heavy-duty and needs to last forever, E-Z LOK is your guy. If you need custom or small orders, hit me up, I can hook you up with Insert Solutions stuff too. Also, always use the recommended drill size for the insert you’re using—drilling a 1/32” too big or too small can mess up the whole installation. I usually send out a little cheat sheet to my clients that has drill sizes for all the common brands, so they don’t waste time messing up parts.
Wait, let me make sure I didn’t miss any big brands. Oh, what about RivetNut? No, wait, RivetNut is a rivet nut, not a self-tapping insert—they’re installed differently, you have to rivet them, right? Yeah, that’s a different product. Another one: Textron Fasteners? Wait, do they make self-tapping inserts? Yeah, they have a line called Taptite, wait no—Taptite is a screw, not an insert. My bad. Alright, the main common brands are E-Z LOK, Helical STI, Keenserts, ThreadForm, and Insert Solutions for custom stuff. That’s the core lineup I stock, anyway.
I should also mention why brands matter beyond just name recognition. A lot of these brands invest in testing their inserts, making sure they meet industry standards (like ISO or aerospace standards), which is non-negotiable for regulated industries like medical or aerospace. If you’re making a plane part, you can’t use a no-name insert that hasn’t been tested for fatigue or corrosion. Those big brands put their money into R&D, so their products are consistent. You get the same quality insert every time you order a case, whereas no-name ones can vary from batch to batch.
At the end of the day, self-tapping inserts are a small part, but they’re super critical. You don’t want to be the person whose product fails because a threaded hole stripped. As a supplier, my job isn’t just to sell you inserts—it’s to help you pick the right one for your specific job. If you’re not sure which brand or size you need, don’t guess. Reach out, tell me what material you’re using, how much torque you’ll be applying, if it’s for indoor or outdoor use, and I’ll point you in the right direction. Whether you’re a big manufacturer needing 100,000 inserts a month or a hobbyist building a custom drone and only need a dozen, I can help.
Wait, that sounds natural, right? No formal stuff, just a supplier talking. Let me wrap this up. Remember, the common brands are E-Z LOK, Helical STI, Keenserts, ThreadForm, and Insert Solutions for custom needs. Skip the cheap no-names for critical applications, and don’t hesitate to hit me up if you need help picking the right one. That’s way better than ending with a salesy line that feels fake.
Self-Tapping Inserts References:
- "Self-Tapping Inserts: A Guide to Selection and Application," Fastener Technology Association, 2022.
- E-Z LOK Product Catalog, 2024.
- Helical Insert Systems STI Insert Technical Data Sheet, 2023.
- Keenserts: Locking Insert Solutions for Soft Materials, Keensert Inc., 2021.
- "Inserts for 3D Printed Parts and Plastic Components," Plastics Industry Association, 2023.
- ThreadForm Self-Tapping Insert Application Guide, 2022.
- Insert Solutions Custom Insert Capabilities, 2024.
Locking Inserts Technologies Co., Ltd.
As one of the most professional self-tapping inserts manufacturers and suppliers in China, we’re featured by quality products and good service. Please rest assured to wholesale bulk self-tapping inserts in stock here from our factory. Also, custom service is available.
Address: 205, 2/F, Bldg. A8, Zhizaogu Ind. Park, No.26 Xingye 5th Rd, Bao’an Dist., Shenzhen, Guangdong, P.R.China
E-mail: sales@lockinginserts.com
WebSite: https://www.lockinginserts.com/
